PSAT Troubles

Does anyone know how to change profile info on Blue Book? I need to change the ethnicity question. I am taking the PSAT today and had to make sure everything was set up properly with my high school counselor. Now, both my grandfathers and one of my grandmothers have some Native American in them, but we don't really know how much. When talking with my counselor, she asked me if I had any of the other races on there. I said no and just selected Caucasian. As we were talking about it a little bit, I mentioned something about how I wish I knew how much Native American I had because I don't think it's much, but some of my grandfather's talk about it once in a while. She told me to click it, but I said I shouldn't and didn't. She pressured me into selecting that as one of my answers. I know she was trying to be helpful, but what do I do? Thank you!